Improvement in chronograph-watches



C. H. MEYLAN Chronograph Watch.

No. 202,041. Patented April 2,1878.

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UNITED STATES PATENT OFFICE.

CHARLES H. MEYLAN, OF NEWGIORK, N. Y.

IMPROVEMENT IN CHRONOGRAPH-WATCHES.

Specification forming part of Letters Patent No. 202,041, dated April 2,1878; application filed December 7, 1877.

To all whom it may concern:

Be it known that I, CHARLES H. MEYLAN, of the city and State of NewYork, have invented an Improvement in Watches, of which the following isa specification:

This invention relates to that classof watches known in the trade ascenter second chronographs, in which there is a second-hand in thecenter of the dial and a stop-motion applied thereto. In chronographs ofthis character the hand has usually been connected to the train ofgearing in the watch, so that when the hand was stopped the works alsowere stopped, and thereby the correct time was lost.

In my present improvements a positive connection is employed between thesecond-hand and the works of the watch, which connection is entirelysevered when the hand is stopped, so that the works continue theiraccurate movement.

In the drawings, Figure 1 is a vertical section of the connectingmechanism. Fig. 2 is an inverted plan of the disengaging-wheel, and Fig.3 is a plan of the grooved connecting-wheel.

' The arbor a and wheel 9 are of ordinary character, and revolve once ina minute. I) is the watch-plate, upon which is the bridge 0, carryingthe cannon or hollow journal for the arbor d, at the outer end of whichis the second-hand f, and at the inner end is the wheel or disk 6 andheart cam h.

At the end of the arbor ais a wheel or disk, 7:, the face of which iscut with very fine grooves radially to the center, and upon theheart-cam h is a point, 2', either conical or chisel shaped, adapted toenter one of the grooves in the wheel 7r, and there is a spring, 0, topress the pin iagainst the wheel k, and so connect the second-arbor a tothe second-hand f and give motion to the latter.

There may be two or more connectingpoints, 2'.

It is common in watch-movements to have a push-pin or shank, whichperforms three 151,899, and need not be further described.

Z is a wedge-shaped slide or arm adjacent to the edge of the wheel 6,and a is the usual lever or arm that acts against the heart-cam h tomove the same and turn the hand to XII. These parts are operated by thepush-pin in the usual manner.

The secondhand being stationary, the first push of the pin removes thelever 02 of the heart-cam and also the incline Zfrom the wheel 0, sothat the spring 0 brings the point 6 down into one of the grooves in thewheel 1;, and connects the second-hand to the watch-works to be revolvedby the same, and the parts are reliably connected; and when the push-pinis operated a second time it moves the incline l, the wheel 6 israisedbodily, and the pin or point t is separated from the wheel 7c, andthe second-hand is stopped and firmly held. The works are free tocontinue tomove without friction or encumbrance of any kind. hen thepush-pin is operated the third time, the lever-arm n is brought intoaction against the heart-cam b, so as to turn the same and bring thehand to XII.

I am aware that the second-hand has been placed in the center of thewatch and c011- nected to the ordinary second-arbor by beveledgear-wheels that can be separated when the hand is stopped, and that theheart-cam has been used in connection with such stopworks. In this case,however, the beveled gears only drive the second-hand by the trio tionalcontact of their edges. A radiallygrooved plate and points have beenused for connecting the second-arbor with the tubular second-hand arbor;but the same was not adapted to the center of the watch-movement, andthe rotating arbor was subjected to frietion when the second-hand was atrest.

I claim as my invention- The combination, with the second-arbor a andits finely-grooved wheel 7.1, of the independent arbor I, second -handf, spring 0, wheel 0, slide or wedge l, heart-cam h, and point 2',substantially as and for the purposes set forth.

Signed by me this 5th day of December, A. D. 1877.

O. H. MEYLAN.

Witnesses:

GEO. T. PINGKNEY, CHAS. H. SMITH.

